Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.74: Poster

Tuesday, March 27, 2007, 15:00–19:00, Poster A

Preparation and characterization of periodic two-dimensional two-phase magnets — •Sven Schnittger¹, Sebastian Dreyer¹, Christian Jooss¹, and Sibylle Sievers² — ¹Institut für Materialphysik, Universität Göttingen — ²Physikalisch-Technische Bundesanstalt, Braunschweig

Two-phase magnets play an important role in the production of permanent magnet applications; especially the interplay of the different magnetostatic interactions is of great interest.

In this contribution, a model system for the study of a two-dimensional two-phase ferromagnet is presented. The sample consists of arrays of hard magnetic squares (L1₀-CoPt) embedded in a soft magnetic film (Permalloy, Fe₁₉Ni₈₁). Arrays with different distances of the square elements are prepared.

The fabrication process is done as follows: a magnetron-sputtered CoPt film on a (100)-MgO substrate is structured by electron beam lithography. Electron-resist and exposure parameters of the RAITH electron lithography system have been optimized with respect to straight edges and the realization of well-defined interfaces. The negative structure is etched into the film by reactive ion etching using an aluminum mask. The Permalloy film is deposited by ion beam sputtering.

The magnetic characterization is accomplished by a magneto-optical indicator film technique using the Faraday Effect and by magnetic force microscopy.